Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D265/00—Heterocyclic compounds containing six-membered rings having one nitrogen atom and one oxygen atom as the only ring hetero atoms
  • C07D265/04—1,3-Oxazines; Hydrogenated 1,3-oxazines
  • C07D265/12—1,3-Oxazines; Hydrogenated 1,3-oxazines condensed with carbocyclic rings or ring systems
  • C07D265/14—1,3-Oxazines; Hydrogenated 1,3-oxazines condensed with carbocyclic rings or ring systems condensed with one six-membered ring
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
  • C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
  • C07D401/04—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings directly linked by a ring-member-to-ring-member bond
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C231/00—Preparation of carboxylic acid amides
  • C07C231/02—Preparation of carboxylic acid amides from carboxylic acids or from esters, anhydrides, or halides thereof by reaction with ammonia or amines
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C237/00—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups
  • C07C237/28—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups having the carbon atom of at least one of the carboxamide groups bound to a carbon atom of a non-condensed six-membered aromatic ring of the carbon skeleton
  • C07C237/30—Carboxylic acid amides, the carbon skeleton of the acid part being further substituted by amino groups having the carbon atom of at least one of the carboxamide groups bound to a carbon atom of a non-condensed six-membered aromatic ring of the carbon skeleton having the nitrogen atom of the carboxamide group bound to hydrogen atoms or to acyclic carbon atoms
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C271/00—Derivatives of carbamic acids, i.e. compounds containing any of the groups, the nitrogen atom not being part of nitro or nitroso groups
  • C07C271/06—Esters of carbamic acids
  • C07C271/08—Esters of carbamic acids having oxygen atoms of carbamate groups bound to acyclic carbon atoms
  • C07C271/26—Esters of carbamic acids having oxygen atoms of carbamate groups bound to acyclic carbon atoms with the nitrogen atom of at least one of the carbamate groups bound to a carbon atom of a six-membered aromatic ring
  • C07C271/28—Esters of carbamic acids having oxygen atoms of carbamate groups bound to acyclic carbon atoms with the nitrogen atom of at least one of the carbamate groups bound to a carbon atom of a six-membered aromatic ring to a carbon atom of a non-condensed six-membered aromatic ring
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D231/00—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
  • C07D231/02—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings
  • C07D231/10—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
  • C07D231/14—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D231/16—Halogen atoms or nitro radicals
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D265/00—Heterocyclic compounds containing six-membered rings having one nitrogen atom and one oxygen atom as the only ring hetero atoms
  • C07D265/04—1,3-Oxazines; Hydrogenated 1,3-oxazines
  • C07D265/12—1,3-Oxazines; Hydrogenated 1,3-oxazines condensed with carbocyclic rings or ring systems
  • C07D265/14—1,3-Oxazines; Hydrogenated 1,3-oxazines condensed with carbocyclic rings or ring systems condensed with one six-membered ring
  • C07D265/24—1,3-Oxazines; Hydrogenated 1,3-oxazines condensed with carbocyclic rings or ring systems condensed with one six-membered ring with hetero atoms directly attached in positions 2 and 4
  • C07D265/26—Two oxygen atoms, e.g. isatoic anhydride

Definitions

• 3-substituted 2-amino-5-halobenzamides are useful starting materials for preparing arthropodicidal diamides of anthranilic acid.
• WO 2006/062978 discloses that 3-substituted 2-amino-5-ha]obenzamides can be prepared by halogenation of corresponding 3-substituted 2-aminobenzamides.
• the amino group is strongly activating for electrophilic substitution on the benzene ring
• 3-substituted 2-aminobenzamides react rapidly with electrophilic halogenating reagents at the 5-position.
• This invention provides a method for preparing a compound of Formula 1
• R 1 is H, C j -C 4 alky], cyclopropyl, cyclopropylmethyl or methylcyclopropyl;
• R 2 is CH 3 or Cl; and X is Cl or Br; comprising contacting a compound of Formula 2
• This invention also provides a method for preparing the compound of Formula 2 wherein R 2 is CH3 or Cl; and X is Cl or Br; comprising contacting a compound of Formula 4
• R 3 is C 1 -Cg alkyl or C 3 -Cg alkenyl, each optionally substituted with up to 3 halogen and up to 1 phenyl; with phosphorus tribromide.
• This invention further relates to a novel compound of Formula 4 wherein R 2 is CH 3 or
• R 3 is C j -Cg alkyl or C 3 -Cg alkenyl, each optionally substituted with up to 3 halogen and up to 1 phenyl; and X is Cl or Br; provided that when R 2 and X are each Cl, then R 3 is other than CH 3 ; which is a useful intermediate for preparing compounds of Formulae 1 and 2 by the aforedescribed methods.
• This invention also relates to a method for preparing a compound of Formula 5
• X is Cl or Br
• Z is CR 7 or N
• R 1 is H, Ci-C 4 alkyl, cyclopropyl, cyclopropylmethyl or methylcyclopropyl;
• R 2 is CH 3 or Cl
• R 4 is Cl, Br, CF 3 , OCF 2 H or OCH 2 CF 3 ;
• R 5 is F, Cl or Br
• R 6 is H, F or Cl
• R 7 is H, F, Cl or Br; using a compound of Formula 1.
• This method is characterized by preparing the compound of Formula 1 from the compounds of Formulae 2 and 3 by the method indicated above.
• compositions comprising, “comprising,” “includes,” “including,” “has,” “having” or any other variation thereof, are intended to cover a non-exclusive inclusion.
• a composition, process, method, article, or apparatus that comprises a list of elements is not necessarily limited to only those elements but may include other elements not expressly listed or inherent to such composition, process, method, article, or apparatus.
• radical e.g., alkyl or alkenyl
• radical is unsubstituted or is substituted with one or more substiruents up to any stated limit of number of substituents.
• optionally substituted includes the option of no substitution, the phrase “each optionally substituted with 1-3 substituents” means that optionally 0, 1, 2 or 3 substituents are present. Therefore "each optionally substituted with
• 1-3 substituents is synonymous with “each optionally substituted with 0-3 substituents” and with “each optionally substituted with up to 3 substituents”.
• Related phrases reciting "optionally substituted” are defined analogously.
• "each optionally substituted with up to 3 halogen” is synonymous with “each optionally substituted with 1-3 halogen”
• "each optionally substituted with up to 1 phenyl” is synonymous with “each optionally substituted with 0-1 phenyl”.
• halogen when “halogen” is recited in the context of a range that includes 1 or more than one (e.g., “up to 3 halogen"), the singular word form “halogen” means “halogens” or “halogen atoms” when more than one halogen atom is present. When more than one substituent is present, each substitution is independent of the other. For example, when two or more halogens are present as substituents, each of the halogen atoms can be the same or different halogens. Ratios are generally recited herein as single numbers, which are relative to the number 1 ; for example, a ratio of 4 means 4 : 1.
• carboxylic acid means an organic chemical compound comprising at least one carboxylic acid functional group (i.e. -C(O)OH).
• carboxylic acid does not include the compound carbonic acid (i.e.
• Carboxylic acids include, for example, formic acid, acetic acid, propionic acid, chloroacetic acid, benzoic acid, maleic acid, and citric acid.
• the term “effective pK a " refers to the pK a of the carboxylic acid functional group, or if the compound has more than one carboxylic acid functional group, "effective pK a " refers to the pK a of the most acidic carboxylic acid functional group.
• the "effective pH" of a nonaqueous substance or mixture is determined by mixing an aliquot of the substance or mixture with about 5 to 20 volumes of water and then measuring the pH of the resulting aqueous mixture (e.g., with a pH meter).
• a “substantially anhydrous” substance means the substance contains no more than about 1% water by weight.
• the chemical name "isatoic anhydride” is another name corresponding to the current
• Embodiment Al The method described in the Summary of the Invention for preparing a compound of Formula 1 comprising contacting a compound of Formula 2 with a. compound of. Formula 3 in the presence of a carboxylic acid.
• Embodiment A2 The method of Embodiment Al wherein R 1 is Ci-C 4 alkyl, cyclopropyl, cyclopropylmethyl or methylcyclopropyl.
• Embodiment A3 The method of Embodiment A2 wherein R 1 is C 1 -C 4 alkyl or cyclopropylmethyl.
• Embodiment A4. The method of Embodiment A3 wherein R 1 is methyl.
• Embodiment A5. The method of Embodiment Al wherein the mole ratio of the compound of Formula 3 to the compound of Formula 2 is from about 1.1 to about 2.
• Embodiment A5a The method of Embodiment A5 wherein the mole ratio of the compound of Formula 3 to the compound of Formula 2 is from about 1.1 to about 1.5.
• Embodiment A5b The method of Embodiment A5a wherein the mole ratio of the compound of Formula 3 to the compound of Formula 2 is from about 1.1 to about 1.3.
• Embodiment A5c The method of Embodiment A5b wherein the mole ratio of the compound of Formula 3 to compound of Formula 2 is from about 1.2 to about 1.3.
• Embodiment A6 The method of Embodiment Al wherein the compound of Formula 2 is contacted with the compound of Formula 3 in the presence of the carboxylic acid and in the presence of a suitable organic solvent.
• Embodiment A7 The method of Embodiment Al wherein the compound of Formula 2 is contacted with the compound of Formula 3 in the presence of the carboxylic acid in a reaction medium comprising a suitable organic solvent.
• Embodiment A8 The method of Embodiment A7 wherein the reaction medium contains 5% water by weight or less.
• Embodiment A9 The method of Embodiment A8 wherein the reaction medium contains 1% water by weight or less.
• Embodiment AlO The method of Embodiment A9 wherein the reaction medium contains 0.1 % water by weight or less.
• Embodiment Al l The method of Embodiment A7 wherein the reaction medium is substantially anhydrous.
• Embodiment A12 The method of any one of Embodiments A6 and A7 wherein the organic solvent comprises one or more solvents selected from esters, ketones, nitriles, haloalkanes, ethers, and halogenated and nonhalogenated aromatic hydrocarbons.
• Embodiment A13 The method of Embodiment A12 wherein the organic solvent comprises a C2-C3 alkylcarboxylic acid ester of a C 1 -C 3 alkanol.
• Embodiment A14 The method of Embodiment A13 wherein the organic solvent comprises ethyl acetate.
• Embodiment Al 5 The method of Embodiment Al wherein the contact is in a reaction medium having a pH in a range of from about 3 to about 7
• Embodiment A16 The method of Embodiment A15 wherein the carboxylic acid is selected to provide a pH within said range.
• Embodiment A17 The method of Embodiment Al wherein the carboxylic acid has an effective pK a between about 2 and about 5.
• Embodiment Al 8 The method of Embodiment Al wherein the carboxylic acid is
• Embodiment A 19 The method of Embodiment Al 8 wherein the carboxylic acid is acetic acid.
• Embodiment A20 The method of Embodiment Al wherein the mole ratio of the compound of Formula 3 to the carboxylic acid is from about 0.6 to about 3.
• Embodiment A20a The method of Embodiment A20 wherein the mole ratio of the compound of Formula 3 to the carboxylic acid is from about 0.6 to about 1.2.
• Embodiment A20b The method of Embodiment A20 wherein the mole ratio of the compound of Formula 3 to the carboxylic acid is from about 0.8 to about 3.
• Embodiment A20c The method of Embodiment A20b wherein the mole ratio of the compound of Formula 3. to the carboxylic acid is from about 0.8 to about 1.2.
• Embodiment A21 The method of Embodiment Al wherein the compound of Formula 2 is contacted with the compound of Formula 3 and the carboxylic acid at a temperature ranging between about 5 and about 75 0 C.
• Embodiment A21a The method of Embodiment A21 wherein the temperature is between about 15 and about 70 0 C.
• Embodiment A21b The method of Embodiment A21a wherein the temperatures is between about 35 and about 60 0 C.
• Embodiment A21c The method of Embodiment A21b wherein the temperature is between about 35 and about 55 °C.
• Embodiment A21d The method of Embodiment A21b wherein the temperature is between about 50 and about 60 0 C.
• Embodiment A22 The method of Embodiment A21d wherein the temperature is between about 50 and about 55 0 C.
• Embodiment A23 The method of Embodiment Al wherein the compound of Formula 3 is added to a mixture of the compound of Formula 2 and the carboxylic acid.
• Embodiment A24 The method of Embodiment A23 wherein the compound of Formula 3 is added in anhydrous form (i.e. substantially anhydrous form).
• Embodiment A25 The method of Embodiment Al wherein the compound of Formula
• Embodiment A26 The method of Embodiment Al wherein the compound of Formula
• Embodiment Bl The method described in the Summary of the Invention for preparing a compound of Formula 2 comprising contacting a compound of Formula 4 with phosphorus tribromide.
• Embodiment B4. The method of Embodiment Bl wherein R 3 is C 1 -C 4 alkyl.
• Embodiment B5. The method of Embodiment B4 wherein R 3 is unbranched at the carbon atom of R 3 bonded to oxygen.
• Embodiment B6 The method of Embodiment B5 wherein R 3 is methyl or ethyl.
• Embodiment B7 The method of Embodiment B 1 wherein the compound of Formula 4 is contacted with the phosphorus tribromide in the presence of a suitable organic solvent.
• Embodiment B8 The method of Embodiment B 1 wherein the organic solvent comprise one or more solvents selected from esters, nitriles, hydrocarbons and halogenated hydrocarbons.
• Embodiment B8a The method of Embodiment B8 wherein the organic solvent comprises one or more solvents selected from esters, nitriles, haloalkanes, and halogenated and nonhalogenated aromatic hydrocarbons.
• Embodiment B9. The method of Embodiment B8a wherein the organic solvent comprises one or more solvents selected from haloalkanes, and halogenated and nonhalogenated aromatic hydrocarbons.
• Embodiment B 10 The method of Embodiment B9 wherein the organic solvent comprises one or more solvents selected from 1 ,2-dichloroethane, benzene, toluene, xylene and chlorobenzene.
• Embodiment B I l The method of Embodiment B lO wherein the organic solvent comprises toluene.
• Embodiment B12 The method of Embodiment B 1 wherein the mole ratio of the phosphorus tribromide to the compound of Formula 3 is from about 0.3 to about 3.
• Embodiment B 12a The method of Embodiment B12 wherein the mole ratio of the phosphorus tribromide to the compound of Formula 3 is from about 0.3 to about 0.5.
• Embodiment B 13 The method of Embodiment B 12a wherein the mole ratio of the phosphorus tribromide to the compound of Formula 3 is from about 0.33 to about 0.40.
• Embodiment B 14 The method of Embodiment B 1 wherein the compound of Formula
• Embodiment B 14a The method of Embodiment B 14 wherein the temperature ranges between about 50 and about 80 0 C.
• Embodiment B 14b The method of Embodiment B 15a wherein the temperatures ranges between about 60 to about 75 0 C.
• Embodiment B 15 The method of Embodiment B 14b wherein the temperature ranges between about 60 and about 70 0 C.
• Embodiment Cl The method of any one of Embodiments Al and Bl wherein R 2 is methyl.
• Embodiment C2 The method of any one of Embodiments Al and Bl wherein X is Cl. Embodiment C3. The method of any one of Embodiments Al and Bl wherein X is Br. Embodiment C4. The method of any one of Embodiments Al, A4 and Bl wherein R 2 is CH 3 and X is Cl. Embodiment Dl.
• a compound of Embodiment Dl wherein R 2 is CH 3 .
• Embodiment D3. A compound of Embodiment Dl wherein R 3 is C 1 -C 4 alkyl.
• Embodiment D4. The compound of Embodiment D3 wherein R 3 is unbranched at the carbon atom of R 3 bonded to oxygen.
• Embodiment D5. The compound of Embodiment D4 wherein R 3 is methyl or ethyl.
• Embodiment D6 A compound of Embodiment Dl wherein X is Cl.
• Embodiment D7 A compound of Embodiment Dl wherein X is Br.
• Embodiment D8 A compound of Embodiment Dl wherein R 2 is CH 3 and X is Cl.
• Embodiment D9. A compound of Embodiment Dl wherein R 2 is CH 3 and X is Br.
• Embodiment DlO A compound of any one of Embodiments Dl, D8 and D9 wherein R 3 is C 1 -C 2 alkyl.
• Embodiment D 11 The compound of Embodiment DlO wherein R 2 is CH 3 , R 3 is CH 3 , and X is Cl.
• Embodiment D 12 The compound of Embodiment DlO wherein R 2 is CH 3 , R 3 is
• Embodiment D13 The compound of Embodiment DlO wherein R 2 is CH 3 , R 3 is CH 2 CH 3 , and X is Cl.
• Embodiment D14 The compound of Embodiment DlO wherein R 2 is CH 3 , R 3 is CH 2 CH 3 , and X is Br.
• Embodiment D 15 A compound of Embodiment Dl wherein when X is Cl, then R 2 is other than Cl.
• Embodiment D16 A compound of Embodiment Dl wherein R 2 is CH 3 .
• Embodiment El The method described in the Summary of the Invention for preparing a compound of Formula 5 using the compound of Formula 1 prepared from the compounds of Formulae 2 and 3.
• Embodiment E2 The method of Embodiment El wherein X is Cl.
• Embodiment E3 The method of Embodiment El wherein X is Br.
• Embodiment E4 The method of Embodiment El wherein Z is N.
• Embodiment E5. The method of Embodiment El wherein R 1 is C 1 -C 4 alkyl, cyclopropyl, cyclopropylmethyl or methylcyclopropyl.
• Embodiment E6 The method of Embodiment E5 wherein R 1 is ⁇ 4 alkyl or cyclopropylmethyl.
• Embodiment E7 The method of Embodiment E6 wherein R 1 is methyl.
• Embodiment E8 The method of Embodiment El wherein R 2 is CH 3 .
• Embodiment E9 The method of Embodiment El wherein R 4 is Br.
• Embodiment ElO The method of Embodiment El wherein R 5 is Cl.
• Embodiment El l The method of Embodiment El wherein R 6 is H.
• Embodiment E12 The method of Embodiment El wherein R 1 is CH 3 , R 2 is CH 3 , R 4 s Br, R 5 is Cl, R 6 is H, X is Cl, and Z is N. Embodiments of this invention can be combined in any manner.
• a substituted anthranilamide of Formula 1 is prepared by contacting from a substituted isatoic anhydride of Formula 2 with an amine of Formula 3 in the presence of a carboxylic acid.
• the carboxylic acid acts as a buffer to reduce the effective pH of the reaction mixture.
• carboxylic acids are useful in the present method, as the only requirement is for at least one carboxylic acid group to impart acidity. Other functional groups can be present, and more than one carboxylic acid group can be present on the carboxylic acid molecule.
• the carboxylic acid in the present method has an effective pK a in the range of about 2 to about 5.
• Carboxylic acids include, for example, formic acid, propionic acid, chloroacetic acid, benzoic acid, phthalic acid, maleic acid, tartaric acid and citric acid.
• carboxylic acids such as formic acid, acetic acid, propionic acid and benzoic acid are preferred.
• Acetic acid which is commercially available at low cost in its anhydrous form (known as "glacial acetic acid") is particularly preferred.
• the combination of the carboxylic acid with the basic amine of Formula 3 forms an amine salt of the carboxylic acid.
• This amine salt can be preformed before addition of the isatoic anhydride compound of Formula 2, or the amine salt can be generated in situ by metering the amine of Formula 3 into a mixture of the compound of Formula 2 and the carboxylic acid.
• the present method is best carried out by maintaining the effective pH of the mixture during the reaction between about 3 and about 7.
• the effective pH of the mixture results from the buffering effect of the carboxylic acid in combination with the amine of Formula 3
• the effective pH can be adjusted according to the effective pK a of the carboxylic acid by adjusting the molar ratio of carboxylic acid to amine of Formula 3.
• the molar amounts of the amine of Formula 3 to carboxylic acid are in the range from about 0.6 to about 3, more typically from about 0.8 to about 3. More particularly, when the mode of combination involves metering the amine of Formula 3 into a mixture of the isatoic anhydride compound of Formula 2 and carboxylic acid, the molar ratio of Formula 3 amine to carboxylic acid is preferably from about 0.85 to about 3.
• the molar ratio of Formula 3 amine to carboxylic acid is preferably from about 0.8 to about 1.05; as long as a nearly equimolar ratio (e.g., about 0.95 to about 1.05) of Formula 3 amine to carboxylic acid is used, the amine salt thus formed is typically used in a ratio of about 1.1 to about 5 molar equivalents relative to the compound of Formula 2.
• the molar ratio of amine of Formula 3 to isatoic anhydride compound of Formula 2 should be at least 1.0, although the molar ratio is preferred to be from about 1.1 to about 1.5 for reasons of efficiency and economy, regardless of how the components are mixed.
• the molar amount of amine of Formula 3 relative to compound of Formula 2 can be substantially greater than 1.5, particularly when a nearly equimolar ratio (e.g., about 0.95 to about 1.05) of amine to acid is used.
• the method of Scheme 1 typically achieves the highest product yield and purity when the reaction medium is substantially anhydrous.
• the reaction medium is thus typically formed from substantially anhydrous compounds of Formula 2 and 3 and carboxylic acid.
• the reaction medium and forming materials contain about 5% or less, more preferably about 1% or less, and most preferably about 0.1% water or less (by weight).
• the carboxylic acid is acetic acid, it is preferably in the form of glacial acetic acid.
• the reaction of Scheme 1 is typically conducted in a liquid phase. In many cases the reaction can be carried out without solvent other than the compounds of Formulae 1, 2 and 3 and the carboxylic acid. But a preferred procedure involves use of a solvent that can suspend and at least partially dissolve the reactants.
• Preferred solvents are those which are non-reactive with the reaction components and have a dielectric constant of about 5 or greater, such as alkyl nitriles, esters, ethers, or ketones.
• the solvent should be substantially anhydrous to facilitate achieving a substantially anhydrous reaction medium.
• the weight ratio of solvent to the compound of Formula 2 is typically from about 1 to about 20, and preferably about 5 for reasons of efficiency and economy.
• the method of Scheme 1 forms carbon dioxide as a byproduct. As the method is typically conducted, most of the carbon dioxide formed evolves from the reaction medium as a gas.
• the addition of the compound of Formula 2 into reaction medium containing the amine of Formula 3 or the addition of the amine of Formula 3 into the reaction medium containing the compound of Formula 2 is preferably conducted at such a rate and temperature as to facilitate controlling the evolution of carbon dioxide.
• the temperature of the reaction medium is typically between about 5 and 75 0 C, more typically between about 35 and 60 0 C.
• the product of Formula 1 can be isolated by standard techniques known in the art, including pH adjustment, extraction, evaporation, crystallization and chromatography.
• the reaction medium can be diluted with about 3 to 15 parts by weight of water relative the to starting compound of Formula 2, the pH can be optionally adjusted with either acid or base to optimize the removal of either acidic or basic impurities, the water phase can be optionally separated, and most of the organic solvent can be removed by distillation or evaporation at reduced pressure.
• the compounds of Formula 1 are typically crystalline solids at ambient temperature, they are generally most easily isolated by filtration, optionally followed by washing with water and then drying. Typically no pH adjustment is needed during workup, and water is a useful crystallization medium for the products of Formula 1.
• a substituted isatoic anhydride of Formula 2 is prepared by contacting a compound of Formula 4 with phosphorus tribromide.
• the stoichiometric amount of phosphorus tribromide needed to obtain complete conversion of the compound of Formula 4 to the compound of Formula 2 is one-third molar equivalent.
• the amount of phosphorus tribromide used is between about 0.3 and 3 molar equivalents, with about 0.33 to about 0.4 equivalents being preferred for reason of economy.
• the method of Scheme 2 is typically conducted in a liquid phase, usually comprising a solvent to at least partially dissolve the compound of Formula 4.
• the solvent must be inert to phosphorus tribromide and preferably has a normal boiling point higher than 50 0 C, preferably greater than 70 0 C, to accommodate the reaction temperature.
• solvents suitable for this reaction are hydrocarbons (e.g., cyclohexane, benzene, toluene), halogenated hydrocarbons (e.g., 1-chlorobutane, 1 ,2-dichloroethane, chlorobenzene, ⁇ -dichlorobenzene), esters (e.g., n-buryl acetate) or nitriles (e.g., acetonitrile, benzonitrile).
• hydrocarbons e.g., cyclohexane, benzene, toluene
• halogenated hydrocarbons e.g., 1-chlorobutane, 1 ,2-dichloroethane, chlorobenzene, ⁇ -dichlorobenzene
• esters e.g., n-buryl acetate
• nitriles e.g., acetonitrile, benzonitrile
• Formula 4 with a solvent and then adding phosphorus tribromide.
• the phosphorus tribromide is added to the reaction mixture comprising the Formula 4 compound at such a rate that the temperature of the reaction mixture is maintained in the range between about 50 and 80 0 C.
• the rate of addition of phosphorus tribromide is selected to maintain the temperature of the reaction mixture in the range between about 60 and 75 0 C, as this controls the exothermic reaction and maximizes the purity of the product.
• the product of Formula 2 can be isolated by standard techniques known in the art, including sparging, pH adjustment, extraction, evaporation, crystallization and chromatography. Much of the R 3 Br byproduct and hydrogen bromide remaining in the reaction mixture can be removed by sparging with air or a gas such as nitrogen.
• Compounds of Formula 2 are generally crystalline solids; on cooling the reaction mixture, the product usually crystallizes as a solid that can be collected by filtration, washed with water to remove residual phosphorous acid and hydrogen bromide, and dried.
• the method of Scheme 2 is illustrated by Example 1.
• Compounds of Formula 4 can be prepared by general methods known in the art, including, for example halogenation of corresponding compounds of Formula 11 with chlorine or bromine as shown in Scheme 3.
• nascent chlorine or bromine generated by contact of aqueous hydrochloric acid or hydrobromic acid with hydrogen peroxide according to the general method of German Patent Publication DE 2750292-A1. This method is illustrated by Reference Example 1 for X being chlorine. Corresponding compounds can be prepared by this procedure by substituting hydrobromic acid for hydrochloric acid.
• Example 1 ethyl acetate (50 mL), and acetic acid (3.8 g, 63 mmol). The mixture was heated to 50 0 C, and anhydrous methylamine (1.6 g, 50 mmol) was added below the surface of the mixture while maintaining the temperature at 48-52 0 C. The mixture was held for 1 h at 50 0 C, then water (65 mL) was added, and the ethyl acetate was removed by distillation.
• 6-chloro-8-methyl-2H-3,l-benzoxazine-2,4(lH)-dione (21.0 g, 0.099 mol) (i.e. the product of Example 1), ethyl acetate (100 mL), and acetic acid (12.6 g, 0.21 mol).
• the mixture was stirred at 22 0 C, and anhydrous methylamine (4.3 g, 0.14 mol) was added below the surface of the mixture in portions over 45 minutes while maintaining the temperature at 22—41 0 C.
• Table 1 illustrates particular transformations to prepare compounds of Formula 1 according to a method of the present invention.
• the carboxylic acid is most conveniently acetic acid.
• t means tertiary
• s means secondary
• n means normal
• i means iso
• c means cyclo
• Me means methyl
• Et means ethyl
• Pr means propyl
• Bu means butyl.
• Concatenations of groups are abbreviated similarly; for example, "c-PrCH2 * ' means cyclopropylmethyl.
• Table 2 illustrates particular transformations to prepare compounds of Formula 2 according to a method of the present invention.
• the compounds of Formula 4 listed in Table 3 can be prepared.
• these compounds are useful intermediates that can be made by the method of Scheme 3 and are starting materials for preparing compounds of Formula 2 according to the method of Scheme 2.
• Z is CR? or N
• R 1 is H, C 1 -C 4 alkyl, cyclopropyl, cyclopropylmethyl or methylcyclopropyl;
• R 2 is CH 3 or Cl
• R 4 is Cl, Br, CF 3 , OCF 2 H or OCH 2 CF 3 ;
• R5 is F, Cl or Br
• R 6 is H, F or Cl
• R 7 is H, F, Cl or Br.
• Compounds of Formula 5 are useful as insecticides, as described, for example in PCT Patent Publications WO 2003/015518 and WO 2006/055922.
• a variety of routes are possible for preparing a compound of Formula 5 from a compound of Formula 1.
• a compound of Formula 5 is prepared by combining a compound of Formula 1, a carboxylic acid compound of Formula 6 and sulfonyl chloride according to the general method taught in PCT Patent Publication WO 2006/062978, which is hereby incorporated herein in its entirety by reference.
• a sulfonyl chloride is added to a mixture of the compounds of Formulae 1 and 6 in the presence of a solvent and a base.
• Sulfonyl chlorides are generally of the formula RS(O) 2 Cl wherein R is a carbon-based radical.
• R is C 1 -C 4 alkyl, C j -C 2 haloalkyl, or phenyl optionally substituted with 1-3 substituents selected from the group consisting of halogen, C j -C 3 alkyl and nitro.
• sulfonyl chlorides include methanesuJfony] chloride (R is CH 3 ), propanesulfonyl chloride (R is (CH 2 ) 2 CH 3 ), benzenesulfonyl chloride (R is phenyl), and /7-toluenesulfonyl chloride (R is 4-methylphenyl).
• Methanesulfonyl chloride is of note for reasons of lower cost, ease of addition and/or less waste.
• At least one molar equivalent of the sulfonyl chloride per mole of the compound of Formula 6 is stoichiometrically needed for complete conversion.
• the molar ratio of sulfonyl chloride to the compound of Formula 6 is no more than about 2.5, more typically no more than about 1.4.
• the compound of Formula 5 is formed when the starting compounds of Formulae 1 and 6 and the sulfonyl chloride are contacted with each other in a combined liquid phase, in which each is at least partially soluble.
• the method is most satisfactorily conducted using a solvent in which the starting compounds have significant solubility.
• the method is conducted in a liquid phase comprising a solvent.
• the carboxylic acid of Formula 6 may have only slight solubility but its salt with added base may have more solubility in the solvent.
• Suitable solvents for this method include nitriles such as acetonitrile and propionitrile; esters such as methyl acetate, ethyl acetate, and butyl acetate; ketones such as acetone, methyl ethyl ketone (MEK), and methyl butyl ketone; haloalkanes such as dichloromethane and trichloromethane; ethers such as ethyl ether, methyl /erf-butyl ether, tetrahydrofuran (THF), and p-dioxane; aromatic hydrocarbons such as benzene, toluene, chlorobenzene, and dichlorobenzene; tertiary amines such as trialkylamines, dialkylanilines, and optionally substituted pyridines; and mixtures of the foregoing.
• nitriles such as acetonitrile and propionitrile
• esters
• Solvents of note include acetonitrile, propionitrile, ethyl acetate, acetone, MEK, dichloromethane, methyl ⁇ err-buty] ether, THF, p-dioxane, toluene, and chlorobenzene.
• solvent is acetonitrile, as it often provides products in superior yield and/or purity.
• the reaction of the present method generates hydrogen chloride as a byproduct, which would otherwise bind to basic centers on the compounds of Formulae 1, 5 and 6, the method is most satisfactorily conducted in the presence of at least one added base.
• the base can also facilitate constructive interaction of the carboxylic acid with the sulfonyl chloride compound and the anthranilamide.
• Reaction of an added base with the carboxylic acid of Formula 6 forms a salt, which may have greater solubility than the carboxylic acid in the reaction medium.
• the base may be added at the same time, in alternation, or even after the addition of the sulfonyl chloride, the base is typically added before the addition of the sulfonyl chloride.
• Some solvents such as tertiary amines also serve as bases, and when these are used as solvents they will be in large stoichiometric excess as bases.
• the nominal mole ratio of the base charged to the sulfonyl chloride charged is typically from about 2.0 to 2.2, and is preferably from about 2.1 to 2.2.
• Preferred bases are tertiary amines, including substituted pyridines. More preferred bases include 2-picoline, 3-picoline, 2,6-lutidine, and pyridine. Of particular note as base is 3-picoline, as its salts with carboxylic acids of Formula 6 are often highly soluble in solvents such as acetonitrile.
• the product N-phenylpyrazole-l-carboxamide compounds of Formula 5 can be isolated from the reaction mixtures by methods known to those skilled in the art, including crystallization, filtration, and extraction.
• WO 2006/062978 discloses specific examples relevant to the method of Scheme 4 Pyrazolecarboxylic acid compounds of Formula 6 can be prepared using methods of heterocyclic synthesis known in the literature, including PCT Patent Publications WO 1998/57397, WO 2003/015519, WO 2006/055922 and WO 2006/062978 and references found in the following compendia Rodd's Chemistry of Chemistry of Carbon Compounds, VoI IVa to IVl, S. Coffey editor, Elsevier Scientific Publishing, New York, 1973; Comprehensive Heterocyclic Chemistry, Vol. 1-7, A. R. Katntzky and C W Rees editors, Pergamon Press, New York, 1984; Comprehensive Heterocyclic Chemistry II, Vol.
• Particular methods include contacting a compound of Formula 1 with a compound of Formula 6 in the presence of a dehydrating coupling agent such as 1,3-dicyclo- hexylcarbodiimide, lj'-carbonyldiimidazole, bis(2-oxo-3-oxazolidmyl)phosphinic chloride or benzot ⁇ azo]-l-yloxy-tris(dimethylamino)phosphonium hexafluoroph ⁇ sphate, or a polymer-bound analogous reagent such as ' polymer-bound dicyclohexylcarbodiimide, typically m an inert solvent such as dichloromethane or N ⁇ V-dimethylformamide, as is generally disclosed in PCT Patent Publication WO 2003/15518 Also disclosed by the reference is the alternative of preparing an acyl chlo ⁇ de counterpart of the compound of Formula 6, such as by contact with thionyl chlo ⁇ de or oxalyl ch
• the product compounds of Formula 5 can be isolated from the reaction mixtures by methods known to those skilled in the art, including crystallization, filtration, and extraction.
• Table 4 illustrates particular transformations to prepare compounds of Formula 5 from compounds of Formulae 2 and 3 according to a method of the present invention.
• the conversion of the compound of Formula 1 to the compound of Formula 5 can, for examp] be accomplished according to the method of Scheme 4 using a sulfonyl chloride such methanesulfonyl chloride in the presence of a solvent such as acetonitrile and a base such 3-picoline.

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